# include <stdio.h>
int main()
{
	int t,age;
	scanf("%d",&t);
	for(int i=0;i<t;i++){
		scanf("%d",&age);
		if(age<=14)
			printf("-1");
		else
			printf("%d",age-7);
		if(i==t-1)
			break;
		else
			printf("\n");
	}
	return 0;
}